<?php
/*
 * author:lzt
 * */
namespace WeChatDeveloper\app;

class MiniPhone{

    private $appid;
    private $sessionKey;
    private $encryptedData;
    private $iv;
    private $data = [];
    public static $OK = 0;
    public static $IllegalAesKey = -41001;
    public static $IllegalIv = -41002;
    public static $IllegalBuffer = -41003;
    public static $DecodeBase64Error = -41004;

    public function __construct($config)
    {
        $this->appid = $config["appid"];
        $this->sessionKey = $config["sessionKey"];
        $this->encryptedData = $config["encryptedData"];
        $this->iv = $config["iv"];
    }
    /**
     * @name 获取微信授权的电话号码
     * @return
     */
    public function getPhoneNumber(){
        $errCode = $this->decryptData($this->encryptedData, $this->iv);
        $output = [];
        $output["code"] = $errCode;
        $output["phoneNumber"] = $this->data->phoneNumber;
        $output["purePhoneNumber"] = $this->data->purePhoneNumber;
        return $output;
    }

    /**
     * 检验数据的真实性，并且获取解密后的明文.
     * @param $encryptedData string 加密的用户数据
     * @param $iv string 与用户数据一同返回的初始向量
     * @param $data string 解密后的原文
     *
     * @return int 成功0，失败返回对应的错误码
     */
    public function decryptData($encryptedData, $iv)
    {
        if (strlen($this->sessionKey) != 24) {
            return self::$IllegalAesKey;;
        }
        $aesKey = base64_decode($this->sessionKey);
        if (strlen($iv) != 24) {
            return self::$IllegalIv;
        }
        $aesIV = base64_decode($iv);
        $aesCipher = base64_decode($encryptedData);
        $result = openssl_decrypt($aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
        $dataObj = json_decode($result);
        if ($dataObj == null) {
            return self::$IllegalBuffer;
        }
        if ($dataObj->watermark->appid != $this->appid) {
            return self::$IllegalBuffer;
        }
        $this->data = $dataObj;
        return self::$OK;
    }



}